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Carbed 351w Sputtering Badly

  • Thread starter Thread starter sharp2377
  • Start date Start date Jul 14, 2014

sharp2377

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May 22, 2012
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Jul 14, 2014
#1
  • Jul 14, 2014
  • #1
(Sorry, i meant to write carbed not carved) Last week I was coming home and when I downshifted the car backfired and died. I found a broken magnet in the mallory mechanical advance distributor. I installed a brand new same model distributor and the car fired right up and seemed to idle fine. I took it for a spin and the car is sputtering and popping like crazy and I can't figure it out. I have msd ignition, holley mechanical fuel pump, and a summit 600cfm carb. I recently installed an electric fan at the same time as distributor.Here is what I have tried:
1. Checked timing
2. Changed plugs/wires
3. Tried spare coil
4. Triple checked firing order
5.Cleaned all fuel lines from tank to carb with compressed air.
6. Have 5-5.5 psi at carb
7. Bypassed fuel pressure regulator
8. Tried spare fuel pump
9. Checked float level
10. Cleaned carb and jets

Im down in myrtle beach for mustang week and I'm stuck trying to figure this out. Any useful advise wiuld be really appreciated!
 

jrichker

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#2
  • Jul 14, 2014
  • #2
Bypass the MSD box and see what happens. MSD means " May Suddenly Die"
 

sharp2377

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Jul 14, 2014
#3
  • Jul 14, 2014
  • #3
jricht: 8846841 said:
Bypass the MSD box and see what happens. MSD means " May Suddenly Die"
Click to expand...
I would except that is my only means of ignition. My distributor needs as box to run. MSD told me it would either work or not work and the 6al wouldn't cause sputtering, it just wouldnt run at all.
 

pearlnotchback

5 Year Member
Dec 18, 2011
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Jul 14, 2014
#4
  • Jul 14, 2014
  • #4
Blown power valve in the carb?
 

84Ttop

They make new pistons every day, so why worry?
5 Year Member
Jul 2, 2009
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Jul 15, 2014
#5
  • Jul 15, 2014
  • #5
sharp2377 said:
(Sorry, i meant to write carbed not carved) Last week I was coming home and when I downshifted the car backfired and died. I found a broken magnet in the mallory mechanical advance distributor. I installed a brand new same model distributor and the car fired right up and seemed to idle fine. I took it for a spin and the car is sputtering and popping like crazy and I can't figure it out. I have msd ignition, holley mechanical fuel pump, and a summit 600cfm carb. I recently installed an electric fan at the same time as distributor.Here is what I have tried:
1. Checked timing
2. Changed plugs/wires
3. Tried spare coil
4. Triple checked firing order
5.Cleaned all fuel lines from tank to carb with compressed air.
6. Have 5-5.5 psi at carb
7. Bypassed fuel pressure regulator
8. Tried spare fuel pump
9. Checked float level
10. Cleaned carb and jets

Im down in myrtle beach for mustang week and I'm stuck trying to figure this out. Any useful advise wiuld be really appreciated!
Click to expand...

If you click on thread tools on the top of your post you can edit the title of this thread. Best of luck with the car down at Mustang Week!
 

jrichker

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#6
  • Jul 15, 2014
  • #6
sharp2377 said:
I would except that is my only means of ignition. My distributor needs as box to run. MSD told me it would either work or not work and the 6al wouldn't cause sputtering, it just wouldnt run at all.
Click to expand...
Duraspark II ignition diagram:

Diagram courtesy of /www.billwrigley.com



Note the ballast resistor shown in the diagram: you’ll need that too

See http://webpages.charter.net/1bad6t/duraspark.html for more help.
 
Last edited: Jul 15, 2014

sharp2377

Member
May 22, 2012
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Jul 16, 2014
#7
  • Jul 16, 2014
  • #7
I dont have the duraspark setup. I only have the msd 6a, blaster 2 coil, and a Mallory mechanical advance distributor. My car was originally a 4 cylinder so none of the old ignition components were used.
 

jrichker

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#8
  • Jul 17, 2014
  • #8
Rotsa Ruck said the little Chinese man...

One more reason I would never buy someone's carb conversion. You now have no simple way to troubleshoot ignition problems.
Hopefully someone else has some better ideas...
 

madspeed

Colonel Mustard
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Jul 17, 2014
#9
  • Jul 17, 2014
  • #9
84Ttop said:
If you click on thread tools on the top of your post you can edit the title of this thread. Best of luck with the car down at Mustang Week!
Click to expand...


Had to change it, the carving was making me hungry for turkey
 
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jrichker

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#10
  • Jul 17, 2014
  • #10
Alternative to DuraSpark and may be the cheap solution to replace/bypass the MSD box

See [urlhttp://www.junkyardgenius.com/jeep/cj503.html[/url] for how to use a GM-HEI module instead of a DuraSpark box. It is supposed to be less than $30 at the auto parts chain stores like AutoZone or Advanced Auto Parts.

 
Last edited: Jul 17, 2014

sharp2377

Member
May 22, 2012
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Jul 17, 2014
#11
  • Jul 17, 2014
  • #11
I tried another carb, no luck I just ordered a different distributor overnight from summit. hopefully I can figure this out in time to at least use my car once for mustang week. I will also try bypassing msd or get another box. I dont see any speed shops in myrtle beach
 

sharp2377

Member
May 22, 2012
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Jul 18, 2014
#12
  • Jul 18, 2014
  • #12
It was the dam distributor! Dont order summit brand distributors, even though they say Mallory makes them but my first one didn't last a year and the second one never worked at all. I put an MSD one in this time.
 

jrichker

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#13
  • Jul 18, 2014
  • #13
sharp2377 said:
It was the dam distributor! Dont order summit brand distributors, even though they say Mallory makes them but my first one didn't last a year and the second one never worked at all. I put an MSD one in this time.
Click to expand...
You must like pain... May Suddenly Die will surely rise up and bite you in the wallet at the worst time...
 
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